(2,7-Dimethoxy­naphthalene-1,8-di­yl)bis­(4-fluoro­benzo­yl)dimethanone

The title compound, C26H18F2O4, is a naphthalene derivative in which the two aroyl groups at the 1- and 8-positions (peri positions) are anti to each other. There is an appreciable difference in the dihedral angles between the naphthalene ring system and the two benzene rings [66.88 (7)° and 88.09 (6)°]. In the crystal, weak C—H⋯O inter­actions involving one of the carbonyl groups and an aromatic C—H group ortho to the F atom seem to stabilize the packing of the mol­ecules

1,8-Dibenzoyl-2,7-dimethoxy­naphthalene

The mol­ecule of the title compound, C26H20O4, is located on a twofold rotation axis. The two benzoyl groups are situated in an anti orientation. The dihedral angle between the mean planes of the phenyl ring and the naphthalene ring system is 80.25 (6)°. The phenyl and carbonyl groups in each benzoyl group are almost coplanar. The mol­ecular packing is stabilized by weak C—H⋯O hydrogen bonds and a π–π stacking inter­action between the phenyl rings [centroid–centroid and inter­planar distances of 3.6383 (10) and 3.294 Å, respectively]

1-(4-Chloro­benzo­yl)-2,7-dimethoxy­naphthalene

In the title compound, C19H15ClO3, the dihedral angle between the naphthalene ring system and the benzene ring is 72.06 (7)°. The 4-chloro­phenyl group and the carbonyl group are almost coplanar. An inter­molecular C—H⋯O hydrogen bond is formed between an H atom of the 4-chloro­phenyl group and the O atom of one meth­oxy group, forming a zigzag chain along the a axis

1,8-Bis(4-chloro­benzo­yl)-7-meth­oxy­naphthalen-2-ol ethanol monosolvate

In the title compound, C25H16Cl2O4·C2H6O, the two 4-chloro­benzoyl groups are in syn orientations with respect to the naphthalene ring system and are approximately parallel to each other: the dihedral angle between the benzene rings is 11.43 (16)°. The conformation around each of the carbonyl C—(C=O)—C groups forms a larger angle to the plane of the naphthalene ring system than that to the benzene ring; the angles of the C=O bond vector with the naphthalene ring system and the benzene ring are 55.4 (3) versus 13.5 (3)° and 52.2 (3) versus 17.9 (3)°. An intra­molecular O—H⋯O=C hydrogen bond generates a six-membered ring. In the crystal structure, inter­molecular O—H⋯O hydrogen bonds including the ethanol solvent mol­ecule are observed. A C—H⋯O inter­action also occurs. The ethyl group of the ethanol mol­ecule is disordered over two positions with site occupancies of 0.63 and 0.37. The crystal studied was an inversion twin